[rescue] identify SGI cpu

[Curtis H. Wilbar Jr.]

Scott Quinn wrote:
>>> I have a cpu saved and pulled from an Indigo 2 (I believe).
>>>
>>> It is an R4K class CPU.
>>>
>>> Part number on the bottom is 030-8232-001
>>>       
>> Haven't found the P/N (looks like even SGI doesn't know what
>> it is), but I guess it's the rare R4k/250/1M, got pics?
>>     
>
> No such beast exists- the R4400/250 had 2MB cache.
>
> What you want to look for on the bottom of the processor module is the 
> PM number
>
> (e.g. PM1, PM2 ... PM5,)
>
> PM1 = R4000/100
> PM2 = R4400/150 (both these will work in an Indigo, higher ones won't 
> (CPU voltage drops from 5V to 3.3V above this frequency)
>   

PM2 ... that is what mine says....

So I must have saved this for my R4K Indigo.

Wonder why the p/n doesn't look up at all online.

The circuit board does not extend past the large aluminum heat sink.

-- Curt

> PM3 = R4400/200
> PM4 = R4600/133 (? not positive)
> PM5 = R4400/250/2MB SC
> PMT = R8000/75
> PMT5 = R10000 at 175 or 195MHz.
> PM6 = R4400/175
> PM7 = R4400/200/2MB SC
>
> Quick Indigo compatibility check- if the circuit board extends beyond 
> the big aluminum heatsink it's not a PM2 and can only be used in an 
> Indigo2 (unless it's a PM1 100MHz R4000, as that doesn't use the same 
> heatsink. The board will still be square, though, rather than 
> rectangular). If the board has some exposed memory chips, then it's a 
> 2MB SC module, either 200MHz or 250MHz. If the heatsink has a fan, then 
> it's a R10k module.
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